High-speed screen mill



July 22, 1930. CRlTEs 1,771,163

HIGH SPEED SCREEN MILL Filed June 6, 1929 4 Sheets-sheet 1 y (Dime/Q5.

v July 22, 1930. J, CRlTEs 1,771,163

HIGH SPEED SCREEN MILL Filed June 6, 1929 4 Smets-Sheet 2 mfenm Jb@ J'ZS July 22, 1930.A J. cRrrx-:s

` HIGH SPEED SCREEN VMIEL Filed June'e, 1929 4 Sheets-Sheet 3 ...Yugi

J. CRITES HIGH SPEED SCREEN MILL Filed June 6, 1929 4 Sheets-Sheet 4 @MM-VW gq om 5.;

July 22, 1930.

Patented July 22, 1930 UNITED STATES PATENT OFFICE JOE ORITES, F NEW YORK, N. Y., vASSIGNOB. TO INTERNATIONAL COMBUSTION EN- GINEERING CORPORATION, 0F NE`;T,YORK, N. Y., A CORPORATION OF DELAWARE HIGH-SPEED Application nled .Tune 6,

This invention relates to a new and improved high. speed screen mill, and particularl to improvements in the mechanism for feeing material into the mill, and for ren-l E dering the feeding and grinding elements more accessible for cleaning and repair or replacement purposes.

According to these improvements, the feeding mechanism is arranged at one side of the ,o grinding chamber whereby the material to brieiiy referred to hereinabove, and disclosed more in detail in the specifications which follow.

Another object is vto rovide an improved removable closure mem er for the mill.

Another object is to provide an improved form of feeding mechanism for the mill.

Other objects and advantages of this invention will be more apparent from the follow'ing detailed description of one approved form of apparatus embodying the principles of the invention.

In the accompanying drawings:

Fig. 1 is a side elevation of the mill, parts being shown in longitudinal vertical section,

taken substantially on the line 1-1 of Fig. 2.

Fig..2 is an end elevation of the mill, parts being shown in section, taken substantially on the line 2-2 of Fig. 1.

Fig. 3 is a horizontal section taken substantially on the line 3 3 of Fio'. 2.

Fig. 4 is a perspective view o? the rotary feeding element.

Fig. 5 is a vertical section, taken substantially on the line 5-5 of Fig. 1.

'45' Fig. 6 is a vertical section taken substantially on the line 6--6 of Fig. 1.

The mill housing comprises a main lower housin member 1, which encloses the lower half o v the'grinding chamber 2, and the lower half of the feeding lchamber 3, as well as the SCREEN MILL 1929. Serial N0. 368,901.r

-lower chamber 4, into which the ground or pulverized material passes. The lower wall of grinding chamber 2 comprises a substantially semi-cylindrical screen 5 su ported at its ends and sides by suitable brackets 6 and 7 withimthe housingl 1. The screen 5 will be of appropriate mesh, dependin upon the flneness of the material desired, t is material passing through the screen into the chamber 4, where it may be collected or from which it may pass downwardly through a chute or passageinto some suitable collection receptacle.

The removable closure or cover member 8 of the housing encloses the upper uhalves of the grinding and feeding chambers 2 and 3, respectivel This cover 8 is provided at one end with brackets 9, by which it is loosely hinged at 10 to brackets 11, secured to the lower housing member 1. The two housing members are normally secured together firmly by a -plurality of bolt connections 12 positioned at suitable intervals around the connecting plane between the two members.

The movable grinding element comprises a main supporting shaft 13, to which is secured a spider construction 14, in which are hinged the inner ends of the swing hammers A15, which are thrown outwardly by centrifugal force as the pulverizing member is rotated so as to crush the material contained in chamber 2 by impact and by throwing this material against the to liner or breaker plate 16 secured within t e closure member 8, and the screen 5. The end portions of the rotary driven shaft 13 are journaled in roller bearing assemblies 17 and 18 supported in thefhousing 1. It will be noted.

24, open at its upper end to receive tlie ma municating at itsl lower end with the cylin-l terial to be ground or pulverized and comdrical chamber which-forms an extension of the feeding chamber 3, already referred to.

A laterally extending opening or feed pasm what less length than the width ofthe assembled rotary grinding element in chamber 2. The rotary feed member 27 is journaled for rotation about a horizontal axis in the communicating feeding chambers 3 qu/formed in 25 ber portion 25 and 3o veyor 33 of opposite pitch two screw conveyors and 25, the shaft extension 2 8 at one end of element 27 being journaledin a bearing 29 formed in one wall'of hopper 23, and the shaft extension 30 at the opposite end of Ielement 27 being journaled in bearing-31 the main housing 1. The feeding element 27 is in the forni of a section of hollow shafting, on one end 'portion of which is Aformed the spii'al screw conveyor 32 of a length sufficient to occupy all of the chamto extend into feeding chamber 3 to a position somewhat beyond one end of the opening 26, leading to the grinding chamber. On the opposite end portion of element 27 is formed a screw conto the screw 32 and ofa length sufficient to extend .from the opposite end of chamber 3 to a position somewhat beyond the adjacent end of opening 26. On that portion of element 27 between the 32 and 33, is formed a tangentially projecting paddles adapted t0 eject material 26 into the grinding chamthese paddles 34 are plurality of or propellers 34 through opening ber 2. As here shown,

'arranged in pairs extending from diametrically opposite sides of the shaft 27, and the airs are arranged in staggered relation at 90 with one another, as clearly shown in Figs. 1, 3 and 4.

It will now be apparent that when the feeding element is rotated .in the proper direction (clockwise, as seen in Fig. 5), by a mechanism hereinafter described, material fed down by gravity through hopper 24 will be forced into and through the feeding chamber 3,`by the screw propeller be ejected by paddle 34 through opening .26 into thegrinding chamber 2.. Any material that passes beyond the opposite end of opening 26 will be returned into the path of paddle 34 by the screw propeller 33 of opposite pitch.

A rotary agitator 35 of any suitable form is mounted within the hopper chamber 24 and supported on a shaft 36 journaled in the' opposite walls of the hopper. A gear 37 keyed on one end of shaft 36 meshes with .a gear 38 keyed on shaft 28, whereb the agitator is driven from the feeding e ement 27 whenever this element is rotated. A remov- 32 and then will able closure plate 39 closes the chamber 40,

formed at one end ofthe hcpper 23 for en- Y closing the gears 37 and 38. hand wheel 41 is secured to the projectingl'en'd of slianft 28,

whereby the rotary feedin element 27 may be rotated by hand when esired. A

A small pulle 42 secured to the free end of rinding sha t 13 is connected by belt 43 wit the large pulley 44 mounted on oneend of counter-shaft 45, journaled in bearings 46 and 47 formed on the upper side of closure member 8. On the oppositeend of shaft 45 is keyed a pinion 48 meshing with a large gear 49 mounted on a stub shaft 50 journaled in one side wall of cover member 8 and in the removable gear housing which is secured to the side of the closure 8 and houses the gears 48 and 49. On the outer end of stub shaft 50 is secured a driving crank 51. A link 52 is pivotally connected at its ends with free end portions of crank 51 and a lever 53 fulcrumed at its upper end 54 on the side of housing 8. A slide block 55 is held in adjusted position lengthwise of lever 53 by means of suitable set screws 56. A ratchet wheel 57 is keyed on the outer end of shaft 30., projecting from one end of the rotary feed element will now be seen that although the grindingl shaft 13 is rotating at high speed, the crank 51 will be rotated slowly by means of the reduction gearing comprising belt gearing 42, 43 and 44, and there'ducing gears 48 and 49. The slowly rotatingv crank 51will, through link 52, oscillate the lever. 53 about its fulcrum 54. This lever 53 will in turn oscillate the two pawl carriers 58 and 59 about the llO axis of ratchet wheel 57, through the connecting links or itnieiiI 62 and 63 connected with slide bloc 55. By adjusting the position of slide block 55 toward or iwayv from the fulcrum 54 of lever 53, the stroke of the links 62, 63 and consequently of the pawl carriers 58 and 59 may be varie-d throughV certain limits. vIt will now be apparent that when the two pawl carriers are oscillated in one direction, for example, toward the right in Fig. 2, pawl 60 will engage the teeth of ratchet57 and impart a certain amount of rotation to this ratchet wheel and the shaft 30. On the 4return oscillation of the pawl cai'riers, that is, toward the left in Fig. 2, the other pawl 61 will positively engage the ratchet teethto impart a further rotation to the ratchet wheel in the same direction, that is, clockwise', as seen in Fig.`2. In this manner a quite slow and substantially continuous rotation may be im arted to the rotary feeding element 27, an the speed ofthis movement can be varied-within certain limits by adjusting the position of slide block 55 alongl the oscillating lever 53.

In operation, material fed into the upper l0 open end of hopper 24 will pass downwardly by gravity until it is engaged by the rotating screw propeller 32, the rotary agitator 35 serving to reak up this material and prevent clogging of the hopper. The screw propeller 32 will carry this material laterally through the feeding chamber until it is opposite the opening 26, whereuponthe paddles 34 will eject the material through opening 26 into the grinding chamber 2.,-Any material that is not e'ected and finds its way to the opposite end o feed chamber 3 will be returned by the screw propeller 33 into the path of paddles 34. It will be seen that the material projected through opening 26 is 25 brought directly into the path of the rotating impact hammers 15, and this material is fed into the grinding chamber gradually and.

continuously and in constant predetermined amounts, whereby the grinding operation is 30 most eciently carried out.

When it is necessary or desirable to .gain access to the rotary members of the mill, the \fbolts 12 connecting the cover member 8 with the main housingl, and bolts 64 connecting cover 8 with the adjacent side housing members are removed, and the belt 43 and the links 62 and .63 are disconnected', whereupon the entire cover member 8 and the parts carried thereby may be swung back about the hin es 10 permitting access simultaneously to t e rotary grinding member and to the rotary feed member 27 within feed .chamber 3. This permits access to all of the important portions "of the apparatus, and if necessary, 45 additional parts can be removed or replaced in an obvious manner. This apparatus is suitable for grinding paint materials, or for a number of similar purposes. It will be .noted that mechanism is provided for forcibly feeding the material to be ground into the grinding chamber, continuously and over the full width of the grinding elements, without the use of air or suction, thereby greatlyl simplifying the mill construction and the necessary auxiliary devices.

I claim:

1. In a pulverizing mill, a mill housing enclosing a pulverizing chamber and a feeding chamber, with a communicating passage therebetween, and movable pulverizing and 'feeding elements positioned in the respective chambers, the housing comprising a main supporting portion andv a removable cover portion, each portion containing substantially half of each chamber whereby both movable elements will be exposed when the cover is removed.

2. In a pulverizing mill, a mill housing enclosing a pulverizing chamber and a feeding chamber, with a communicating passage therebetween, and movable pulverizing vand feeding elements positioned in{ the respective c ambers, the housing comprising a main supporting portion and a removable cover portion, hinged to the main ortion, each portion containing subst-antia ly half of each chamber whereby both movable elements will be exposed when the cover is swung to open position.

` 3. In a pulverizing mill, a rotary grinding member, a rotary feedmember, the two rotary members being mounted on parallel Vaxes positioned in the same horizontal plane, means for driving the rotary members, and a mill housing enclosing a pulverizing chamber and a feed chamber adapted to house the vgrinding and feed members respectively,

there being a communicating feed opening between the chambers, the housing comprising'a fixed main housing member and a removable closure member, the two members being joined in the horizontal plane ofthe axes of the rotary members.

4. In a' screen mill, a rotary grinding member, a rotary feed member, the two rotary members being mounted on parallel axes positioned in thesame plane, means for driving the rotary members, and a mill housing enclosing a pulverizing chamber and a feed chamber adapted to house -the grinding and feed members respectively, there being a communicating feed opening between the chambers, the housing comprising a fixed main housing and a removable closure member, the two members being joined substantiall in the plane of the axes of the rotary mem ers.

5.- In a screen mill, a rotary grinding member, a rotary feed member, the two rotary members being mounted on parallel axes positioned in the same horizontal plane, means for driving the rotary members, and a mill housing enclosing a pulverizing chamber and a feed chamber adapted to house the grinding and feed members respectively, there being a communicating feed opening between the chambers, the housing comprising a fixed main housing member, and a removable closure member hinged to the main member so that it may be swungback to simultaneously expose both of the rotary members, the two housing members being joined in the horizontal plane of the axesv of the rotary members.

6. In a screen mill, a rotary rinding member, a rotary feed member, t e two rotary members being mounted on parallel axes positioned in the same plane, means for driv- Aing the rotary members, and a mill housing enclosing a pulverizing chamber and a fee chamber adapted to house the grinding and feed members respectively, there b ing` a communicating feed opening between he chambers, the housing comprising a fixed main housing and a removable closure member hinged to the main member so that it may be swung back. to simultaneously expose both of the rotary members, the two housing members being joined substantially in the plane of the axes of the rotary members.

7. In a screen mill, a rotary grinding memqber, a rotary feed member, the two rotary members -being mounted on parallel axes positioned in the same horizontal plane, a mill between the chambers, the housing comprising a main housing member and a removable closure member joined to the main member in the horizontal plane of the axes of the rotary members, a motor mounted' on the main housing member for driving the grinding member, and reduction gearing connecting the grinding member with the feed member.

8. In a screen mill, a rota-ry grinding member, a rotary feed member, the two rotary members being mounted on parallel axes positioned in the same horizontal plane, a mill housing enclosing a pulverizing chamber and a feed chamber'adapted to house the grinding member and the feed member respectively, there being a communicating feed opening between the chambers, the housing comprlsin a main housing member and a removab e closure member hinged to the main member inthe horizontal plane of the axes of the rotary members, a motor mounted on the main housing member for driving the 'grinding member, and reduction gearing connectling the grinding member with the feed mem- 9. In a screen mill, a rotary grinding member, a rotary feed member, the two rotary members being mounted on parallel 'axes positioned in the same horizontal plane, a mill housing enclosing a pulverizing chamber and a feed chamber adapted to house the grinding member and the feed member respectively, the housing comprising a. main housing V member and a` removable closure member joined to the main member in the horizontal plane of the axes of the rotary4 members, a motor mounted on 'the main housing member for driving the grinding member, and reduction gearing connecting the grinding member with the feed member, a portion of this reduction gearing being carried by the removable'closure member.

10. In a screen mill, a rotary grinding member, a rotary vfeed member, the two rotary members being mounted on parallel axes positioned in the same horizontal plane, a mill housing enclosing a pulverizing chamber and a feed chamber adapted to house the y municating feed grindin member and the feed member respective y, the housing comprising a main housing 4member and a .removable closure member joined to the main member in the horizontal plane ofthe axes of the rotary members, a motor mounted on the main housing member for driving the grinding member, and reduction gearing connectin the grinding member with the feed mem er, al

hopper mounted on the main housing member and communicatin with the feed chamber, an agitator in the opper and means for driving the agitator from the rotary feed member.

11. In a screen mill, a housing enclosing a grinding chamber and a feed c amber positioned at one side thereof, there being a comassage connectin the chambers, a pulverlzing element mova le in the grinding chamber, and mechanical means positioned in the feed chamber for positively conveying material thereinto and ejecting same through the feed passage into the path of the pulverizing chamber.

12. In a screen mill, a housing enclosing a grinding chamber and a feed chamber positioned at one side thereof, there being a communicating feed passage connecting the chambers, a pulverizing element movable in the grinding chamber, a hopper communicating with the feed chamber at a point removed from'the feed passage, and mechanical means positioned in thefeed chamber for positively conveying material from the hopper and ejecting same through the feed passagev into the path of the pulverizing element in the grinding chamber.

13. In a screen mill, a housing enclosing a grinding chamber and a substantially cylindrical feed chamber positioned at one side of the grinding chamber, there being a communicating opening between the adjacent sides of the chambers, a rotary grinding element in the grinding chamber, a rotary feeding element in the feed. chamber, means for rotating the two elements, and a hopper communicating with a portion of the feed chamber laterally removed from the opening betweenthe two chambers, the feeding element being journaled for rotation .on the axis of the cylindrical feed chamber and comprising a screw propeller for conveying material to the opening, and paddles for propelling material through' the openinginto the grinding chamber.

14. In a screen mill, a housing enclosing a grinding chamber anda substantially cylindrical feed chamber positioned at one side of the grinding chamber, there bei-ng a communicating openingv between the adjacent sides of the chambers, a rotary grinding element in the grinding chamber, av rotary feeding element in the feed chamber, means for rotating the two elements, and a hopper comelement in the grinding i municating with a portion of the feed chamber laterally removed from the opening between the two chambers, the feeding element being journaled for -rotation on the. axis of the cylindrical feed chamberand' comprising a screw propeller positioned beneath the hopper and leading up to the opening to the grinding chamber, and paddles opposite this opening for propelling material through the opening into the grinding chamber.

15. In a screw mill, a housing enclosing a grinding chamber and a substantially cylindrical feed chamber positioned at one side .of the grinding chamber, there being a comrotating the two elements, land a hopper c ommunicating with a'portio'n of the feed chamber laterally removed from the opening between the two chambers, the feeding element being journaled for rotation on the axis of the cylindrical feed chamber and comprising a screw propeller positioned beneath the hopper and leading up to the opening to the grinding chamber, a screw propeller of opposite pitch positioned beyond the opening, and paddles opposite the opening for forcing material through the opening into the grinding chamber. j Y' 16. In a screen mill, a housing enclosing a grinding chamber and a substantially cylindrical feed chamber positioned at one side of the grinding chamber, there being a communicating opening between the -adjacent sides of the chambers, a rotary grinding element in the grinding chamber, a -rotary feed element in the feed chamber, means for rotating the two elements, and a hopper communi- 'eating with a portion of the'feed chamber laterally removedlfrom the opening between the two chambers, the feeding element being j ournaled for rotation on the axis of the cylindrical feed chamber and comprising a screw propeller positioned beneath the hopper and leading up -to the opening to the grinding chamber, a screw propeller of opposite pitch positioned beyond the opening, and paddles opposite the opening for forcing material through the opening into the grinding chamber, and an agitator in the'hopper driven from the rotary feeding element.

17. In a screen mill, a housing enclosing a grinding chamber and a substantially cylindrical feed chamber positioned at one side of the grinding chamber, there'4 being a communicating opening between the adjacent sides of the chambers, the housing comprising a main lower portion and a removable cover portion, each portion containing substantially half ofeach chamber, a rotary grinding element in the grinding chamber, a motor for driving the grinding element, a

bracket on the main housing member for supporting the motor, a rotary feeding element in the feed chamber, adjustable reduction gearing for driving the feed element from the grinding element, a hopper communicating with the feed chamber, an agitatorA in the hopper, and means for driving the agitator fromthe feed element.

.18. In a screen mill, a housing enclosing a grinding chamber and a substantially cylindrical feed chamberl positioned at one side of the grinding chamber, there being al communicating opening between the adjacent sides of the chambers, the housing comprising a main lower ortion and a removable cover Eortion, eac portion containing substantia y half of each chamber, a grinding element in the grindlng cham er, a motor for driving the grinding jelement, a bracket on the main housing memment being journaled for rotation on the axis of the cylindrical chamber and comprising a screw propeller for conveyln material from the hopper to the opening eading to the grinding chamber, a screw propeller at the opposite side of this opening for returning material thereto, and paddles opposite the opening for propellin the material through the opening into t e grinding chamber.

19. Ina pulverizing mill, a housing enclosing a grinding chamber and a substantially cylindrical feed chamber at one side of the grinding chamber, there being a communicating opening between the adjacent sides of thechambers, anda rotary feeding element in the feed chamber comprising a screw propeller for conveying material to the opening, and paddles for propelling the material through the opening into the grinding chamber.

20. In a pulverizing mill, a housing enclosing a grinding chamber and a substantially cylindrical feed chamber at one side of the grinding chamber, there being a communicating opening -between the adjacent sides of the chambers, and a rotary feeding element in the feed chamber comprising a screw propeller for conveying the material to the `o ening, a screw propeller of opposite pitc positioned beyon the o ening, and paddles opposite the opening for ,orcing the material through the opemng into the grinding chamber.

21.In a pulverizing mill, a. mill housing enclosing a pulverizing chamber and a feeding chamber, and movable ulverizing and feeding elements position in the respective chambers, the housing comprising Va main supporting portion in which the movable elements are mounted and a removable cover portion which contains a, substantial part of each chamber whereby both movable elements will be exposed when the cover is removed.

JOE .CRITES 

